/*
 * Copyright © 2018 Apple Inc. and the ServiceTalk project authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.servicetalk.concurrent.api;

import static java.util.Objects.requireNonNull;

/**
 * A {@link Completable} implementation for merging {@link Iterable}s of {@link Completable}s.
 */
final class IterableMergeCompletable extends AbstractMergeCompletableOperator<CompletableDynamicCountSubscriber> {
    private final Iterable<? extends Completable> others;
    private final boolean delayError;

    IterableMergeCompletable(boolean delayError, Completable original, Iterable<? extends Completable> others) {
        super(original);
        this.delayError = delayError;
        this.others = requireNonNull(others);
    }

    @Override
    public CompletableDynamicCountSubscriber apply(final Subscriber subscriber) {
        return new CompletableDynamicCountSubscriber(subscriber, delayError);
    }

    @Override
    void doMerge(final CompletableDynamicCountSubscriber subscriber) {
        long count = 1;
        for (Completable itr : others) {
            ++count;
            itr.subscribeInternal(subscriber);
        }
        subscriber.setExpectedCount(count);
    }
}
